इनमें से किस प्राकृतिक संसाधन के लिए भूटान विशेष रूप से जाना जाता है, जो निर्यात के माध्यम से इसकी अर्थव्यवस्था में महत्वपूर्ण योगदान देता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?